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Summary of Expenditures for Property and Equipment by Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Expenditures for property and equipment $ 185,440 $ 169,452 $ 358,627 $ 290,873
U.S. Dialysis And Related Lab Services        
Segment Reporting Information [Line Items]        
Expenditures for property and equipment 150,932 141,656 284,380 247,051
HealthCare Partners (HCP)        
Segment Reporting Information [Line Items]        
Expenditures for property and equipment 18,098 12,951 38,243 17,985
Other Segments        
Segment Reporting Information [Line Items]        
Expenditures for property and equipment $ 16,410 $ 14,845 $ 36,004 $ 25,837